Street names for heroin include smack, horse, skag, H and birdie powder. In Spanish, bombita, gato, tigre, zoquete and caballo refer to heroin. Pure heroin is white, and other colors indicate that it is mixed with something else, which produces another group of street names.
Heroin mixed with marijuana is called atom bomb, woola and woo-woo. When heroin is combined with cold medicine, the result is known as cheese. Beast and LBJ refer to the combination of heroin and LSD. Dealers and addicts sometimes sell or administer heroin combined with a poison, such as strychnine, which is called a hotshot and is intended to kill the recipient.